Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/26—Systems using multi-frequency codes
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/26—Systems using multi-frequency codes
  • H04L27/2601—Multicarrier modulation systems
  • H04L27/2647—Arrangements specific to the receiver only
  • H04L27/2655—Synchronisation arrangements
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/26—Systems using multi-frequency codes
  • H04L27/2601—Multicarrier modulation systems
  • H04L27/2647—Arrangements specific to the receiver only
  • H04L27/2655—Synchronisation arrangements
  • H04L27/2668—Details of algorithms
  • H04L27/2673—Details of algorithms characterised by synchronisation parameters
  • H04L27/2676—Blind, i.e. without using known symbols
  • H04L27/2679—Decision-aided
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
  • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
  • H04L27/38—Demodulator circuits; Receiver circuits

Definitions

• the present invention relates to a method, a system and a receiver in receiving a multi-carrier transmission.
• a DVB-T (Terrestrial Digital Video Broadcasting) transmission system usually provides data rates of 10 Mbps or more. This provides a possibility to significantly reduce the average DVB-T receiver power consumption by introducing a schema which can be based on time division multiplexing (TDM).
• TDM time division multiplexing
• the introduced scheme can be called a time slicing.
• time-slicing An idea of time-slicing is to send data in bursts using significantly high bandwidth at once. The enables a receiver to stay active only a fragment of the time, while receiving bursts of a requested service.
• An example of the time slicing can be depicted in Figure 1. So the original possibly streaming data can be sent as burst with high bandwidth load. Two time slice bursts (100,101) are depicted each burst hav- ing their respective synchronization portion (102) and data portion carrying the service (103).
• the received data can be buffered. For example, if an applicable constant lower bitrate is required by the mobile handheld terminal, this may be provided by buffering the received bursts. Thus the data used by the end-application can be applied even as a stream by unpacking data in the buffer(s).
• the burst duration is 146 ms.
• the constant bitrate (the bitrate at which the burst is read out of the buffer) is 350 kbps (e.g. one streaming service with high quality video)
• the average time between bursts is 6.1 s.
• the total on-time is the addition of the synchronization time plus the burst duration, synchronization times of the handheld receiver must be rigorously minimized in order to better exploit the potential of time-slicing.
• TDM based system such as time slicing to cut power con- sumption to a reasonable number is generalizing for a DVB handheld environment. Therefore, in order to better exploit the potential power reduction, synchronization times of such a receiver should be decreased. A faster synchronization is desirable.
• the position of scattered pilots within an OFDM symbol has to be determined before the channel estimation can be started.
• the scattered pilot position is directly related to the OFDM symbol number within the OFDM frame, no dedicated scattered pilot synchronization is typically included in prior art DVB-T receivers, but the anyhow available TPS-bit-based OFDM frame synchronization (202) instead.
• this implies a variable minimum synchronization time of 17 to 68 OFDM symbols.
• DVB-H DVD in handheld mobile terminal environment
• time-slicing purposes this means the receiver must prepare for the later one, thus 68 OFDM symbols synchronization time have to be reserved.
• EP 1 267 535 Al cites a prior art based approach relying on a system where scattered pilot detector decides the mode of each scattered pilot and compares the sums of powers of subcarriers corresponding to each scattered pilot mode with one another based on the feature that a pilot has greater power than usual data to detect a mode having greatest power among the modes.
• the multi-carrier transmis- sion comprises various symbols, each symbol comprising a plurality of carriers, wherein:
• At least two symbols are accessed which are adapted to establish a correspondence pattern for pilot carriers in a matrix of the at least two symbols
• carriers of the first symbol are correlated with the corresponding carriers of the sec- ond symbol within the matrix for determining a correlation maximum for indicating a pilot carrier position.
• a receiver for receiving a multi-carrier transmission, wherein the multi-carrier transmission comprises various symbols, each symbol comprising a plurality of carriers
• the re- ceiver comprising: a Fast Fourier Transform (FFT) means for FFT transformation of the received transmission for obtaining at least two symbols of the transmission,
• FFT Fast Fourier Transform
• a delay means for delaying an obtained first symbol to obtain another symbol, wherein a matrix, comprising the symbols and their respective carriers, is adapted to establish a correspondence pattern for pilot carriers of the first symbol with pilot carriers of the another symbol within the matrix,
• a correlator means for correlating carriers of the symbol with the corresponding carriers of the another symbol within the matrix
• accumulator means for accumulating correlation results obtained from the correla- tor
• Some embodiments of the invention can find the position of scattered pilots within an OFDM symbol quite fast and yet reliably.
• a synchronization can be based on realizing, that certain identifiable carriers such as scattered pilot carriers can be found at the same standardised positions (i.e. the same carrier index) every standardised symbol. These pilot carriers are highly correlated, while other carriers such as data carriers are not. By sensing possible raster positions of the pilot carriers, a clear distinct correlation magnitude maximum can be found for the current pilot carrier position. A certain symbol can be identified based on the pilot carrier position.
• Various embodiments of the invention give an very fast way of obtaining the identifier ⁇ ) for certain symbol number in the multi-carrier transmission stream. This suffices to proceed with the further channel estimation and synchronization process. As an overall result, the whole synchronization phase of the receiver can be quite dramatically reduced. This is advantageous for mobile receivers, which are operating in TDM based power saving mode.
• Advantageously synchronization time (i.e. until the Channel Estimation) can be significantly reduced.
• some embodiments may work under all relevant channel conditions making the embodiments feasible.
• the scattered pilot raster position of an OFDM symbol can be found reliably.
• the embodied invention can safely substitute the prior art TPS based OFDM synchronization.
• the complexity needed for embodied invention can be relatively low since most of the required computational resources are anyhow available from the post FFT- acquisition, and therefore applicable.
• the post FFT-acquisition computational resources are not mandatory implementations. For example, a more specific design can be applied as well, or other used circuitry of the receiver applied.
• Figure 1 depicts an example of the time slicing concept according to prior art
• Figure 2 depicts an example of DVB-T synchronization sequence according to prior art
• Figure 3 depicts in a form of a flow chart a method for a receiving a signal in accordance with an embodiment of the invention
• Figure 4 depicts an example of scattered pilot positions where carriers correlations are adapted to be applied in accordance with some embodiments of the invention
• Figure 5 depicts an example of simulation results for correlation results in accordance with some embodiments of the invention
• Figure 6 depicts an example of simulation results for minimum protection rations for various channel conditions in accordance with some embodiments of the invention
• Figure 7 depicts an example of simulation results for minimum protection ration vs. fractional carrier frequency offset in accordance with some embodiments of the invention
• Figure 8 depicts an example of simulation results for minimum protection rations vs. Doppler frequency in accordance with yet some embodiments of the invention
• Figure 9 depicts a partial functional block diagram of a receiver for receiving a transmission in accordance with embodiments of the invention
• Figure 10 depicts a general simplified functional block diagram of a receiver for receiving a transmission in accordance with embodiments of the invention
• Figure 11 depicts a general architecture of the system where some principles of the embodiments of the invention can be applied.
• Figure 3 depicts in a form of a flow chart a method for a receiving a signal in accordance with some embodiments of the invention.
• the method start by receiving a multi-carrier transmission and performing a Fast Fourier Transform (FFT) for the received signal in the step 300.
• FFT Fast Fourier Transform
• Various embodiments of the invention apply a method for receiving a multi-carrier signal such as OFDM signal.
• the multi-carrier transmission preferably has a certain scattered raster pilot positions scheme.
• the multi-carrier such as the OFDM signal can be used in DVB.
• the multi-carrier signal is applicable in other systems as well such as mobile phone technology, other digital television sys- terns such as e.g. ISDB (Integrated Services Digital Broadcasting) and in DAB (Digital Audio Broadcasting).
• the multi-carrier transmission e.g. OFDM
• the embodied mobile DVB environment can be referred to as DVB-H (DVB handheld) or earlier sometimes DVB-X also.
• the multi-carrier transmission is received at the receiver.
• the time-slicing concept is preferably applied for saving the power of the receiver, which preferably can be a mobile one.
• the time slicing takes place in form of bursts.
• the receiver can receive and adapt to possibly certain bursts.
• the synchronization into bursts should be fast and reliable enough.
• Some further embodiments of the invention are related to the scattered pilot scheme of DVB-T / DVB-H. The same principle may also be applied to similar pilot schemes.
• the symbol number (e.g. in OFDM: 0 to 67) has to be found.
• the position of the scattered pilots is defined. Scattered Pilots are used for Channel Estimation and Fine- Timing. Therefore, these operations can only be started after the position of the scattered pilots is known. So during synchronization of the receiver, the position of the scattered pilots within the symbols should be determined in order to start the channel estimation.
• the position of scattered pilots within an OFDM symbol has to be determined before the channel estimation can be started.
• the scattered pilot position is directly related to the OFDM symbol num- ber within the OFDM frame, no dedicated scattered pilot synchronization is typically included in standard DVB-T receivers.
• a symbol is obtained and received in step 301.
• the received symbol is now delayed to some extent • in time dependent way in the step 302.
• the received symbol can be delayed pref- erably to certain another symbol.
• the another symbol is received.
• the symbols are transmitted in a certain predetermined se- quenced manner, typically based on standard.
• Various embodiments of the invention relates to receiving the symbols and how to process them.
• the symbol can be received and saved.
• the received symbol can be delayed to obtain another symbol.
• the symbols are transmitted continuously so that a received symbol relates to a certain point in time and another delayed point in time relates to another symbol.
• inventions present an approach to determine the scattered pilot position with a fixed synchronization time of some OFDM symbols. Preferably five or four symbols are applied depending on the definition of applied symbols. Thus, the embodiments allow to proceed with channel estimation and subsequent tasks while OFDM frame synchronization is still being pursued.
• a correlation is calculated for carrier pairs in the step 304.
• the carriers for the correlation are selected from the different symbols, i.e. certain carri- ers of the first symbol and certain carriers of the another symbol.
• the selection of the certain carriers is advantageously based on the correspondence pattern between pilot carriers of the first symbol and pilot carriers of the another symbol.
• the correlation result is stored, preferably to accumulator in the step 305.
• the correlation result can be added to only that one of these, to which the tested carrier belongs to in the embodiments.
• the loop of the steps 304, 305 and 306 can be performed until certain releasing index is reached. If it is not, a next correlation for certain different carriers of these two symbols is calculated according to steps 304 and 305.
• the releasing correlation index and the number of the another symbol is selected in such a way that a certain predetermined known correspondence pattern is established for pilot carri- ers (positions) in a matrix comprising carriers of these two symbols.
• the amount of correlations and the number of the another symbol can be based on the known correspondence pattern for pilot carriers (positions) in the matrix having carriers of these two symbols.
• scattered pilots of the multi-carrier signal can be found at the certain same position every predetermined OFDM sym- 1 bol.
• the same carrier index can be indicated the position of the pilot carrier.
• the pilot carrier repetition pattern in a symbol can advantageously repeat after certain amount of symbols, for example every fourth symbol.
• correlations for a certain carrier pair can be calculated.
• the result is stored into a memory.
• a condition of a releasing carrier index is being checked. If the releasing carrier index is not reached, the calculation and the storing is continued. For example, various carriers of the symbols are processed. If the releasing index is reached, the memory is processed. Accordingly based on correla- tion metrics, certain amount of final correlations are calculated. Final correlations can be calculated in such a way that certain correlation calculation pairs are summed.
• the final correlation result having the maximum, selected from the final correlations, shows the pilot carrier position. Referring back to the example of Fig. 3, a correlation magnitude maximum is determined for the calculated correlations in the step 307.
• a clear distinct correlation magnitude maximum is found for the correlation indicating the pilot carriers indexes because the scattered pilots are highly correlated, while other data car- riers are not.
• the determination or the comparison of the step 307 is performed for the correlations calculated in the loop 304, 305 and 307.
• the certain substantially similar scattered pilot raster position is peri- odically repeated every fourth OFDM symbol.
• the current scattered pilot raster position is determined by the highest magnitude out of these four.
• the channel estimation (CHE) may now continue in the receiving process in the step 308.
• Some embodiments of the invention give a significantly fast way of obtaining the two Least Significant Bits (LSBs) of the OFDM symbol number in a DVB-T / DVB-H data stream.
• the two LSBs suffice to proceed with the further channel estimation and synchronization process.
• fast scattered pilot synchronization can speed up the synchronization time of a DVB-T/H receiver drastically by up to 84%. Especially for a DVB-H receiver working in time-slicing mode, this gives an important reduction in power consumption.
• the scattered pilot raster position of an OFDM symbol is found reliably.
• the fast scattered pilot synchronization can safely substitute the TPS base OFDM frame synchronization.
• the potential of the time-slicing can be better exploited as the synchronization times of the receiver is significantly minimized under various circumstances.
• Figure 4 depicts an example of scattered pilot positions where carriers correlations are adapted to be applied in accordance with some embodiments of the invention.
• some embodiments of the invention proposing a fast scattered pilot synchroni- zation, the position of the scattered pilots within the OFDM symbol, and thus the two LSBs of the OFDM symbol number, is found after a fixed delay of five OFDM symbols. Since synchronization can only proceed after this position is found, a speed-up of up to 63 OFDM symbols (i.e. ⁇ 63ms in 8k mode) is achieved compared to the TPS based solution. For the time-slicing, this is the relevant number, because the DVB-H time-slicing receiver must prepare for the worst-case delay in order to guarantee synchronization.
• the position of scattered pilots can be, for example, given in the standard publication "Digital Video Broadcasting (DVB)", ETSI ETS 300 744, incorporated herein as a reference, as:
• Figure 4 illustrates the position of the scattered pilots (shown as dark spots).
• the data carrier are depicted as circles in the example.
• a horizontal axis denotes frequency (f).
• f frequency
• a vertical axis denotes time (t).
• the vertical rows depicts carriers with the same index (K). For example, carriers (400) denoting Kmin to carriers (40Kmax) denoting Kmax. So the symbols transmission/reception is time dependent, and the different carriers in a symbol are frequency dependent.
• a correspondence pattern is established for the pilot carriers (dark spots) in the example of Fig. 4. This is advantageously shown as diagonal lines of pilots are established in the Fig 4. Moreover, certain indexes of carriers of different symbols have the similar appearance within their respective symbol.
• Some embodiments of the fast scattered pilot synchronization utilizes the fact, that after four OFDM symbols the scattered pilot raster position repeats. These scattered pilots are highly correlated, while data carriers are not.
• S(n,c) denotes the c-th subcarrier of the current OFDM symbol (index n) as a complex number.
• examples S(n-4,0), S(n,0), S(n-4,12) and S(n,12) are shown for depicting some of the following formulas. It should be noted that for the sake of clarity only first positions of correlations Cl, Cl ', C2, C3, and C4 (possible pilot carrier positions) according to the formulas are depicted. The other position can be obtained based on the given formulas running the index p further.
• SPRP current scattered pilot raster position
• the SPRP clearly indicates the position of the pilot, thereby enabling a symbol to be recognized.
• the examples of the formulas C l ,C 2 , C 3 , C and C l ' can produce numerical real values. However, in some further embodiments complex and/or the numerical values can be applied, i.e. the values can represent absolute values of i/q -parameters.
• the indexes in the formulas can be adopted to correspond with the scattered raster pilot positions of the applied pattern.
• the Fig. 4 depicts an example only and do not limit the invention to the specific pattern of Fig. 4.
• the pilot positioning can be such that the same carrier index in different symbols may not necessary correspond but i.e. different carrier indexes of different symbols corresponds. All that this would require, is the predetermined regular known pattern for scattered raster pilot positions that the formulas can be adopted to the predetermined regular known pattern in question.
• the correlations C and ' have the maximum. Accordingly, a certain symbol can be deduced to be the currently received symbol based on this correlation.
• the time needed for some embodiments of the fast scattered pilot synchronization can advantageously be only five OFDM symbols.
• 8k mode this translates into 11 - 13.4 ms.
• these numerical values only 8% of the total on-time is needed until channel estimation. Compared to standard TPS synchronization, this is an improvement of 84%.
• a complete system environment has been built up in Synopsys' CoCentric System Studio, that comprises a complete DVB-T/H transmitter and a bit-true DVB-T/H receiver.
• the channel model allows to chose between several profiles, such as AWGN (Add White Gaussian Noise) or a mobile channel with AWGN.
• AWGN Additional White Gaussian Noise
• the implementation of the tap generation process for mobile channel is based on 'Channel Simulator I: Direct Form' .
• Figure 5 shows an example of simulation for various embodiments of the invention with the results for 128 consecutive runs of scattered pilot synchronization at different levels of AWGN.
• PR protection ration
• MPR min(PR(n)); n e [ ⁇ ;12l] .
• FIG. 6 shows examples for the minimum protection rations (MPRs) for three different channel conditions.
• MPRs minimum protection rations
• SNR signal to noise ratio
• Simulations can be done for the 2k mode with guard interval 1/32, i.e. OFDM symbol duration 224 ⁇ s plus 1 ⁇ s guard interval.
• the 'SFN' case may intentionally suffer from extreme inter symbol interference (ISI).
• ISI extreme inter symbol interference
• the example of Fig. 6 indicates that the distinguishing of the correlation maximum can be quite reasonably possible if, for example, the numeric value in the example is over 1.0.
• a minimum protection ration of 1.13 i.e. no false detections
• result at - 5dB SNR can be achieved.
• the correlation maximum indicating the scattered raster pilot position can ad- vantageously be identified.
• FIG. 7 shows the exemplary results for 2k mode, guard interval 1/32 using a Rayleigh channel profile at 0 dB SNR. Frequency offset is given in per cent of the subcarrier spacing. After Post-FFT synchronization, this should be far below 25%.
• a figure 8 depicts simulation results of further embodiments comparing minimum protection ratio with Doppler frequency.
• a series of simulations can be carried out to check the sensitivity to Doppler frequency.
• Common simulation parameters are 2k mode, guard interval 1/32, Rayleigh channel profile, and 10% subcarrier spacing offset.
• the example of Figure 9 shows the results for 0 dB SNR and 5 dB SNR.
• One way to deal with an environment with extreme Doppler can be to repeat the fast synchronization procedure for another symbol pair.
• Even more robustness for embodiments of the invention can be achieved by repeating, for example the process of Fig. 3. So the embodied process is performed for a first symbol pair, and the reception is delayed to another symbol pair. Accordingly four symbols are accessed now and the two pairs each are correlated. The second round may verify the results of the first rounds. There can be even more repetition rounds repeating the process for making the recognition and accordingly proper reception more robust.
• Figure 9 depicts a partial functional block diagram of a receiver for receiving a transmission in accordance with embodiments of the invention.
• a decision block (909) is meant to do the maximum search.
• Some embodiments of the receiver can be adapted to carry out the process of the example of Fig. 3.
• the receiver com- prises a FFT block (901) for performing the FFT for the received multi-carrier signal such as the OFDM signal.
• the FFT block (901) or the like is coupled with a delay block (902).
• the FFT block (901) is also coupled with a correlator (903).
• the delay block (902) is coupled with the correlator (903).
• a symbol is obtained and received by the FFT (901).
• the delay block (902) can be adapted to delay the re- ceived symbol to some extent in time dependent way.
• the received symbol can be delayed preferably to certain another symbol.
• the delay block (902) may then obtain the another symbol.
• the correlator (903) is adapted to calculate a correlation for a carrier pair.
• the carriers for the correlation are selected from the different symbols, i.e. first carrier of the first symbol and first carrier of the another symbol.
• the correlator (903) is coupled with accumulators 1 - 4 (905 - 908) via the demultiplexer (904).
• the accumulators (905 - 908) are adapted to store the respective correlation calculation results, e.g. correlation Cl can reside in the accumulator 1 (905).
• the decision block (909) is adapted to test the correlation results of the accumulators (905 - 908). Control logic for ending the accumulating of the correlations is omitted in the figure 9 for simplicity reasons.
• the number of the correlations and the respective accumulator are not limited to four as in the example.
• the decision block (909) can advantageously calculate or find a correlation magnitude maximum for the calculated correlations.
• a clear distinct correlation magnitude maximum is found for the correlation indicating the pilot carriers indexes because the scattered pilots are highly correlated, while other data carriers are not.
• the decision block can be coupled with the channel estimation (CHE) (910) possibly to continue in the receiving process.
• CHE channel estimation
• Some embodiments may relate to a DVB-T derived standard, called 'DVB-H' which has awoken great deal of interest, and it will most probably support, among others, the feature of 'Time-Slicing' . This will be the key enabler to support DVB-H in small and portable devices, such as mobile phones.
• the complexity needed for implementing various embodiments of the synchronization technique is fairly low, since most of the required computational resources are anyhow available from post-FFT acquisition.
• the post FFT- acquisition computational resources are not only mandatory implementations.
• a more specific design can be applied as well, or other used circuitry of the receiver applied.
• Embodiments of the invention can be implemented in any DVB-T / DVB-H receiver. In an embodiments of the invention this can be done in an ASIC for example.
• the block which will include the scattered pilot synchronization, can be the BUF (Buffer) of the receiver.
• This buffer block can be used to store the data carriers and scattered pilot carriers of several OFDM symbols in order to allow channel estimation (CHE) to span over several OFDM symbols.
• CHE channel estimation
• the demultiplexer that splits the carriers into data carriers, continual pilot carriers, scattered pilot carriers, and possibly TPS carriers. In order to do so, the position of the scattered pilots (the carrier indices of these) has to be known. Position of all the others is constant.
• the traditional way was to use the TPS synchronization that, besides others, determines the OFDM symbol number within an OFDM frame. So this manner of operation may be replaced by the embodiments of the in- vention.
• FIG. 10 depicts a more general functional block diagram of the receiver.
• the illustrated receiver 1000 may be used in any or all of the various embodiments.
• the receiver comprises a processing unit (1003), a multi-carrier signal receiver part (1001) such as OFDM signal receiver and a user interface (UI).
• the user interface comprises a display (1004) and a keyboard (1005).
• the UI comprises an audio input (1006), and audio output (1007).
• the processing unit (1003) comprises a microprocessor (not shown), possibly a memory (not shown) and software (not shown).
• the processing unit (1003) controls, on the basis of the software, the operations of the receiver 1000, such as receiving a signal, receiving the data stream, receiving of a symbol, receiving another symbol delaying the received symbol, correlating the scattered pilot carriers of the two different symbols, comparing the correlation results, determining the position of the scattered raster pilot position, calculating the symbol in question.
• Various operations are described in the examples of Figs. 3 - 9. Referring to the Fig. 10, alternatively, middleware or software implementation can be applied (not shown).
• the receiver 1000 can be a hand-held device or a mobile device which the user can comfortable carry.
• the receiver 1000 can be a mobile phone which comprises the multi-carrier signal receiver part (1001) such as the OFDM receiver for receiving OFDM signal.
• the receiver may interact with the service providers.
• the receiver (1100) operates preferably under coverage of a digital broadcast network (DBN) (1101) applying e.g. OFDM radio signal based transmission.
• the receiver is capable of receiving the transmission the DBN is providing and receives the OFDM based signal.
• Operations of the receiver can be receiving a signal, receiving the data stream, receiving of a symbol, receiving another symbol by delaying the reception, correlating the carrier of the two different symbols, comparing the correlation results, determining the position of the scattered raster pilot position, determining the symbol in question.
• Various operations are described in the examples of Figs. 3 - 9.

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• 2003
  • 2003-09-22 CN CNB038271079A patent/CN100571236C/zh not_active Expired - Fee Related
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  • 2003-09-22 WO PCT/FI2003/000690 patent/WO2005029802A1/en active Application Filing
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  • 2003-09-22 EP EP03818694A patent/EP1665707A1/de not_active Withdrawn
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